Core technical requirements: first, landing door strength upgrade, landing door/car door panel single metal plate, thickness ≥1.5mm, impact resistance increased by 50%, preventing impact deformation, falling off; second, multiple anti-pinch protection, light curtain + safety edge + pressure feedback triple protection, closing force ≤120N, obstacle trigger at 1mm, anti-pinch failure automatic stop, alarm; third, door lock device strengthening, electrical + mechanical dual interlock, engagement depth ≥7mm, 100,000 times no fault, power failure automatic locking, preventing landing door accidental opening; fourth, fault self-diagnosis, door system real-time monitoring door lock status, closing torque, motor current, abnormal automatic early warning, record fault, maintenance precise positioning; fifth, fire resistance requirement, fire elevator door fire resistance ≥90 minutes, smoke tightness, air tightness meet standards, preventing fire spread. After implementation, door system accidents decreased by 80%, door system risk accounting for 60% of elevator accidents effectively controlled.